[GRASS5] Re: [GRASS5]r.neighbors question

[Kevin Slover]

Glynn,
    The -z option should be kept, unless the r.neighbors module is changed.
What I noticed is that it included areas that were equal to null, and set
those to zero.
Example using d.what.rast:

81:43:52.5W 27:58:22.5N
 gabby62_rtest.rast in PERMANENT, quant   (0)
 gabby62_rtest.rast in PERMANENT, actual  (0.000000)no data  -> using
r.neighbors -z option
      gabby62.rast in PERMANENT, quant   (Null)
      gabby62.rast in PERMANENT, actual  (Null)no data -> initial raster

Maybe this is a bug...but I generally choose not to use the -z option, and
have found ways to work around the problem.  I work with irregularly shaped
data sets...and taking out the -z option would make the images that I create
false...creating more work for me....




Glynn Clements wrote:

> Kevin Slover wrote:
>
> > I am using r.neighbors to increase the resolution of rasters that I have
> > created, and have noticed something interesting...maybe it is my lack of
> > understanding of something in the program, but....I am getting null
> > values in the resulting raster.  It appears that it is setting values of
> > 0 to null in the result...which then creates gaps in the images...any
> > ideas on what might be causing this??
>
> then:
>
> > Please disregard the last email from me.  I just read one of the options
> > for r.neighbors, and it appears that I should put a -z to preserve zero
> > outputs...
>
> Should r.neighbors' "-z" flag be kept? Is there any reason why zero
> should be converted to null?
>
> --
> Glynn Clements <glynn.clements at virgin.net>
> _______________________________________________
> grass5 mailing list
> grass5 at grass.itc.it
> http://grass.itc.it/mailman/listinfo/grass5

--
LTJG Kevin Slover, NOAA
GIS Specialist/Meteorologist/Oceanographer
Tropical Prediction Center/Technical Support Branch
11691 SW 17th Street Miami FL 33165
(W) 305-229-4456  (F) 305-553-1264


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